[gcc r14-8553] gccrs: Add a list of weak keyword

[Arthur Cohen <cohenarthur@gcc.gnu.org>]

https://gcc.gnu.org/g:2fe5baf3dc1a563834b696b0aa63b68cffd27b56

commit r14-8553-g2fe5baf3dc1a563834b696b0aa63b68cffd27b56
Author: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>
Date:   Thu Nov 16 15:02:11 2023 +0100

    gccrs: Add a list of weak keyword
    
    Retrieving a weak keyword value is done using raw values. Introducing a
    list of weak keywords means this could change.
    
    gcc/rust/ChangeLog:
    
            * util/rust-keyword-values.h (class WeakKeywords): Add new class with
            weak keyword constexpr.
    
    Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

Diff:
---
 gcc/rust/util/rust-keyword-values.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gcc/rust/util/rust-keyword-values.h b/gcc/rust/util/rust-keyword-values.h
index 769b2100c41f..4a6f1df525d0 100644
--- a/gcc/rust/util/rust-keyword-values.h
+++ b/gcc/rust/util/rust-keyword-values.h
@@ -41,6 +41,20 @@ public:
 #undef RS_TOKEN
 };
 
+class WeakKeywords
+{
+public:
+  static constexpr auto &AUTO = "auto";
+  static constexpr auto &BUILTIN = "builtin";
+  static constexpr auto &CATCH = "catch";
+  static constexpr auto &DEFAULT = "default";
+  static constexpr auto &GEN = "gen";
+  static constexpr auto &MACRO_RULES = "macro_rules";
+  static constexpr auto &RAW = "raw";
+  static constexpr auto &UNION = "union";
+  static constexpr auto &YEET = "yeet";
+};
+
 } // namespace Values
 } // namespace Rust